--- Comment #5 from schwab at linux-m68k dot org 2010-08-10 12:42 ---
The most portable way to put a pointer value in a jlong is a = (uintptr_t)arg.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45246
--- Comment #4 from pinskia at gmail dot com 2010-08-10 12:36 ---
Subject: Re: New: optimizer dereference
On Aug 10, 2010, at 1:00 AM, "attardi at di dot unipi dot it"
wrote:
> Code produced using -O2 handles dereferencing incorrectly.
> Here is a program that shows the bug:
>
> #
--- Comment #3 from attardi at di dot unipi dot it 2010-08-10 10:27 ---
You are right.
SWIG does this on purpose, as the most portable way to cast a pointer into a 64
bit integer:
"For non-primitive types the "in" and "out" typemaps are responsible for
casting between the C/C++ pointer
--- Comment #2 from rguenth at gcc dot gnu dot org 2010-08-10 08:54 ---
void* baseptr = 0;
*(std::vector **)&baseptr = (Derived *)arg;
you are accessing an object of type void* via an lvalue of type
std::vector *.
--
rguenth at gcc dot gnu dot org changed:
What
--- Comment #1 from paolo dot carlini at oracle dot com 2010-08-10 08:17
---
What happens if you add -Wall to the command line? Current mainline tells me:
u.cc: In function void* foo(void*):
u.cc:12:31: warning: dereferencing type-punned pointer will break
strict-aliasing rules
u.cc:
